import sys
import pygame
pygame.init()
size = width, height = 1040, 840
screen = pygame.display.set_mode(size)
color = (0, 0, 0)

ball = pygame.image.load("ball1.png")
ballrect = ball.get_rect()

speed = [5,5]
clock = pygame.time.Clock()
while True:
    clock.tick(60)
    for event in pygame.event.get():
        if event in pygame.event.get():
            pygame.quit()
            sys.exit()

        ballrect = ballrect.move(speed)
        if ballrect.left < 0 or ballrect.right > width:
            speed[0] = -speed[0]
        if ballrect.top < 0 or ballrect.bottom > height:
            speed[1] = -speed[1]

        screen.fill(color)
        screen.blit(ball, ballrect)
        pygame.display.flip()